Arc-lamp.



C. A. B. HALVORSON, Jn. & W. L. HARRADEN.

ARC LAMP.

APPLICATION FILED MAR-1,1913.

1,915 Patented Feb. 6,1917.

2 SHEETS-SHEET I.

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W Waler L.Harraden,

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C. A. B. HALVORSON, JR. & W. L. HARRADEN.

ARC LAMP. 7 APPLICATION FILED MAR. l, 1913.

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Their fittorfiey Cromwel IfiBHalvorson Jr.

Walter L. Harraden by WM mt lvrwms PETERS co Puom-umu wasmm; run. 0 c.

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GROMWELL A. B. HALvonson, an, or s nuous, Ann WALTER L. HARRADEN, or LYNN,

MASSACHUSETTS, ASSIGNOBS TO GENERAL ELECTRIC OF NEW YORK.

COMPANY, A CORPORATION ARC-LAMP.

Specification of Letters Patent.

Patented net. e, tor a.

Application filed March 1, 1913. Serial No. 751,478.

To all whom it may concern:

Be it known that we, GnoMWnLL A. B. HALvonsoN, Jr., and W'AL'rnn L. HARRADEN, citizens of the United States, and residents, respectively, of Saugus and Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

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Our invention has reference to an arc lamp that is mounted upon a standard or other support, and more particularly to a lamp of this character in which fumes are evolved requiring removal from the lamp.

Our invention comprises an arc inclosing globe, open at the top and bottom, and a novel organization of parts which are so arranged as to freely admit fresh air through the bottom of the globe and evacuate the gases through the top thereof, and at the same time the arrangement is such as to both shield the are from the influence of gusts of air and to produce a draft through the globe, which does not itself make the arc unsteady or cause it to collapse. These considerations are of importance and are particularly important when the arc itself has a tendency to be unsteady, as is the case with a flaming or luminous are which is long and slender and easily influenced by lateral drafts. In the specific arrangement which we have adopted, the air enters the globe be low the arc and in a downward direction, that is to say away from the are, as will appear more fully hereinafter.

Our invention has for a further object the provision of a chimney passing through the top of the globe for carrying away the products of combustion and means for closing the top of the globe around the chimney, the whole being so arranged that the parts may readily be removed from the top of the globe, thereby makingit possible to trim the lamp through the top of the globe without removing the globe from the lamp. Other novel features of our invention will appear in the description and will be particularly pointed out in the claims.

For a fuller understanding of our invention reference may be had to the accompanying drawings, in which Figure 1 is a vertical sectional view of a lamp embodying our invention; Fig. 2 is a side elevation of the top of the globe and the chimney and cooperating parts lifted from the globe and revolved about an eccentric axis through 180; Fig. 3 is a vertical section showing in detail a portion of the eccentric member on which the chimnev is supported; Fig. l is a view similar to Fig. 3, showing the rod, on which the chimney is supported, elevated and revolved through an angle of 180; Fig. 5 1s a detail view of the draft tube and the guide immediately surrounding the lower electrode; Fig. 6 is a detail view of the centering device for the chimney, and Fig. 7 is another detail view.

Referring to the drawings, 1 is the top of a standard or other support on which the arc lamp embodying our invention is mounted. A bottom plate 2 is secured to the standardl by suitable spacing posts, not shown in the drawing. The middle of the plate 2, which may conveniently be made by casting, is turned upwardly to form a long tapering shell or draft tube 3 which extends well up into the globe, and is provided near its top with a series of openings 4. through which the air is discharged into the globe; these openings are remote from the region Where fresh air enters the lamp below the plate 2, as will appear further on. The top of the shell 3 is enlarged at 3 and around this enlarged part a baffle 5 is secured which breaks the force of the draft and diverts the same downwardly. A bushing or guide 6 for the lower electrode is seated in the top of the shell 3 and closely surrounds the electrode. A guide rod 7 is secured at the top to the bushing 6 and at the bottom is suitably secured in the lamp standard. In this embodiment of our in vention we have shown the outer edge of the top plate 2 turned downwardly to form a flange 2*, on which is seated an insulated annularring 8, which thus becomes in efl ect a part of the bottom plate which closes the bottom of the globe. The globe 9, which is open at the top and bottom is seated on the ring 8 and forms a tight joint therewith. A casing 10 surrounds the operating mechanism of the lamp and is loosely received at the top within a flange formed on the insulating ring 8; this fit is purposely made loose and imperfect so that an annular open ing is left through which the air necessary for the operation of the lamp may pass. A tube 11 is suitably secured at the bottom to the standard orsupport 1 and passes through an insulated bushing 11 which is secured to the plate 2 by a clamping plate 11 by means of bolts 11 which pass through ears formed on the insulated bushing and on the clamping plate respectively. An ins-ulating thimble 11 surrounds the sleeve 11 and is located immediately above the insulated bushing 11 to prevent the ash pan, which is not here shown, from coming in contact with the tube 11 which this thimble surrounds. A supporting rod 12 for the chimney 13 is received within the tube 11, which thus becomes a sleeve for the latter. The chimney is provided at its bottom with an enlarged portion 14, which forms a fume pot for collecting the products of combustion which are evolved from the arc. The top of the rod 12 is received within :1 lug 15 extending outwardly from the fume pot 14, the rod 12 and the lug 15 being secured together as by set screws 16. A nut 17 is secured in position on the upper threaded end of the sleeve 11. The nut 17 is provided with a tapering projection l7 (see Fig. 6) which is received in a corresponding recess 17 b in the lug 15. In this manner the axis of the chimney is given a definite set in alinement with the axis of the draft tube 3, and since the chimney supports the upper electrode 32 and the draft tube'axially surrounds the lower electrode 34, the two electrodes are by the device described maintained in alinement. The nut 17 is held in position by a jamb nut 17. A plate 18 closely surrounds the chimney 13 and is provided at its outer edge with a flat surface 19 carrying an asbestos ring 20, against which the top of the globe 9 is seated and forming therewith a substantially air-tight joint in order that no air may enter at the top of the globe. Air can thus enter the globe only at the openings 4. The plate 18 is further made air-tight against the chimney 13 by a suitable packing ring 21 received within an annular recess formed on the inner side of the enlarged inner portion 18 is best shown in Fig. 3. An arm 23 has its upper end turned inwardly and the inner end of this arm is received in the groove 22 and thus acts as a guide for the rod 12. This arm is secured to a plate 24 by screw 25, and the plate is in turn secured to the sleeve 11 by set screws 26. The bottom of the rod 12 is provided with a transverse slot 27 in the same plane as the groove 22 for the purpose of supporting the rod 12 and the chimney when the rod is elevated and rotated through 180. The chimney is surrounded by a suitable casing 28 which may be made ornamental in any manner desired. Situated above this casing is mounted a hood 29, which may conveniently be made of a plate 29 having its outer edge spun over a second plate 29. The hood 29 is supported from the casing by suitable spacing sleeves 30 and posts 31.

The upper electrode 32, which in the form of lamp here shown is of the non-consuming The lower electrode 34 may be the ordinary P magnetite electrode, which is well known in the art. The lower electrode is received within the electrode holder 35 carried by an arm 36 surrounding and guided by the rod 7. A sleeve 38 incloses the rod 7 below the arm 36, and a suitable block 37 is secured to the top of the sleeve 38 for engagement with the arm 36.

The operating mechanism for the lamp is not fully shown in the drawings, as the same constitutes no part of our present invention. We have here illustrated our invention embodied in a lamp of the well known magnetite type, which has a drop feed. In these lamps, as is well known, the electrodes are separated when the lamp is without current. When current is turned on, the lower electrode is moved into engagement with the upper electrode and then drops away a predetermined distance to establish the arc. There is no further feeding of the electrodes until the resistance of the arc reaches a predetermined value, when the feeding magnet which is connected across the arc is operatively energized, whereby the lower electrode is again brought into engagement with the upper electrode and the cycle of operation is repeated. The feeding magnet, represented by the numeral 39, is provided with an armature 40 cooperating with the arm of the lifting clutch 41, which is damped in its movements by the usual dash pot 42. The lifting clutch is provided with the usual sleeve 43 embracing the sleeve 38. The holding clutch, which is not here fully shown, is represented by the reference numeral 44. A usual form of resistance 45 is supported from the top plate 2.

A lamp constructed as described above permits the trimming operation to be readily performed in the following manner:

The canopy, comprising the casing 28 and hood 29, is first lifted from the globe. The chimney and the rod 12, on which it is supported, are then lifted until the bottom of the rod 12 is free from the arm 23. The chimney is then swung through an angle of 180 and is allowed to drop until the slot in the bottom of rod 12 receives the inturned end of the arm 23 and the rod rests on the top of this arm. This condition is shown in Fig. 4. The upper electrode and the chimney are thus removed from interference with the lower electrode; the unconsumed portion of the lower electrode may be removed and a new electrode inserted in its place. It will be seen, therefore, that the trimming operation is performed without removing the globe from its seat, and this is a great advantage, as it minimizes the breakage of globes and greatly simplifies the trimming operation.

In accordance with the provisions of the patent statutes, we have described the principle of operation of our invention, together with the apparatus which we now consider to represent the best embodiment thereof; but we desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What we claim as new, and desire to secure by Letters Patent of the United States, is

1. In an arc lamp, an arc'inclosing globe open at the top, a chimney passing through the top of said globe, a vertically movable member for supporting said chimney from the base, and a member slidably surrounding the chimney and adapted to seat on the globe and form a substantially air tight joint with both the chimney and the globe.

2. In an arc lamp, an arc inclosing globe open at the top, a chimney passing through the top of said globe, a vertically movable member for supporting said chimney from the base, and a plate slidably surrounding the chimney and adapted to seat on the globe, said plate being provided on its inner face with a packing ring to form a substantially air tight joint between the chimney and the plate.

3. In an arc lamp, an arc inclosing globe open at its top, a chimney passing through the top of said globe, a vertically movable eccentric member for supporting said chimney from the base, and a plate slidably surrounding the chimney and movable with said chimney to its elevated position, said plate being adapted to seat on the globe and form a substantially air tight joint with both the chimney and the globe.

In witness whereof, we have hereunto set our hands this th day of February, 1913.

GROMWELL A. B- HALVORSON, JR. WALTER L. HARRADEN.

Witnesses:

JOHN A. MCMANUS, Jr., FRANK G. HATTIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratents,

Washington, I). G. 

